Origin8 HUB OR8 SINGLE SPD KIT f/F-HUB ALY 09 RD Converts a cassette hub to a single speed 8 alloy spacers included in various sizes to adjust chain line Available in black or red anodized 6061 alloy Fits SRAM, Shimano, and Campagnolo style cassette bodies 2 conical alloy spacers provide increased cog stiffness